Oracle zero-day defect amplifies panic over Clop’s data theft attack spree

The notorious ransomware group exploited multiple vulnerabilities, including a zero-day, for at least eight weeks before alleged victims received extortion demands.

Federal cyber authorities and threat hunters are on edge following Oracle’s Saturday disclosure of an actively exploited zero-day vulnerability the Clop ransomware group used to initiate a widespread data theft and extortion campaign researchers initially warned about last week. 

Oracle addressed the critical vulnerability — CVE-2025-61882 affecting Oracle E-Business Suite — in a security advisory Saturday and advised customers to apply the patch as soon as possible. The tech giant previously said it was aware some customers had received extortion emails and said vulnerabilities it addressed in its July security update were potentially involved. 

Rob Duhart, chief security officer at Oracle Security, updated his blog post Saturday to alert customers to the zero-day. Oracle did not say the zero-day is actively exploited but it provided indicators of compromise, which indirectly confirm the defect has been exploited in the wild. 

The Cybersecurity and Infrastructure Security Agency added CVE-2025-61882 to its known exploited vulnerabilities catalog Monday, noting that it has been used in ransomware campaigns. 

Brett Leatherman, assistant director of the FBI’s Cyber Division, described the zero-day as an emergency putting Oracle E-Business Suite environments at risk of full compromise. 

“Oracle E-Business Suite remains a backbone enterprise resource planning system for major enterprises and public-sector environments, which means attackers have every incentive to weaponize this one fast,” he said in a LinkedIn post.

The zero-day isn’t the only problem confronting Oracle and its customers. Clop exploited multiple vulnerabilities, including the zero-day, in Oracle E-Business Suite to steal large amounts of data from several victims in August, according to Mandiant Consulting CTO Charles Carmakal. 

Researchers at watchTowr reproduced the full exploit chain after a proof of concept and published a flow chart depicting how attackers chained multiple vulnerabilities together. 

“The chain demonstrates a high level of skill and effort, with at least five distinct bugs orchestrated together to achieve pre-authenticated remote code execution,” watchTowr researchers wrote in a blog post Monday. The cybersecurity firm said there is a high probability more vulnerabilities will be found in Oracle E-Business Suite tied to this campaign. 

The zero-day vulnerability, which has a CVSS rating of 9.8, can be exploited remotely without authentication, resulting in remote code execution. 

The significant lag time between when the attacks occurred and Oracle’s zero-day vulnerability disclosure indicates Clop was breaking into and stealing data from Oracle E-Business Suite customers’ environments for months. Researchers were not aware of the attacks until executives of alleged victim organizations received extortion emails demanding payment. 

CrowdStrike researchers said the first known exploitation occurred Aug. 9, eight weeks before Oracle disclosed and patched the zero-day defect. 

The number of organizations impacted by Clop’s attack spree remains unknown, yet researchers have identified victims across multiple sectors and geographies. Clop’s ransom demands have reached up to $50 million, according to Halcyon.

“We have seen seven- and eight-figure demands thus far,” Cynthia Kaiser, senior vice president of Halcyon’s ransomware research center, told CyberScoop.

“This group is notorious for stealthy, mass data theft that heightens their leverage in ransom negotiations,” she said.

Clop is a ransomware group that has successfully intruded multiple technology vendors’ systems, allowing it to steal data on many downstream customers. The threat group specializes in exploiting vulnerabilities in file-transfer services to conduct large-scale attacks. 

Clop achieved mass exploitation as it infiltrated MOVEit environments in 2023, ultimately exposing data from more than 2,300 organizations, making it the largest and most significant cyberattack that year.

The group is driven by profit, as it operates within a Russia-aligned cybercrime environment, Kaiser said. “Clop’s operations can simultaneously extract financial value and produce outcomes useful to state actors, such as data collection, disruption, or pressure on targeted organizations.”

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